富氢富氧调控的甲烷预混火焰结构和排放特性  

Structure and emission characteristics of premixed methane flame regulated by hydrogen and oxy-fuel enrichment

作　　者：张玮杰 左睿烨 胡光亚 李德立 王金华[1] 黄佐华[1] ZHANG Weijie;ZUO Ruiye;HU Guangya;LI Deli;WANG Jinhua;HUANG Zuohua(State Key Laboratory of Multiphase Flow in Power Engineering,Xi'an Jiaotong University,Xi'an 710049,China)

机构地区：[1]西安交通大学动力工程多相流国家重点实验室,陕西西安710049

出　　处：《中南大学学报（自然科学版）》2024年第7期2792-2800,共9页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(52206169);国家重大科技专项(J2019-III-0014-0058)。

摘　　要：基于单头部钝体旋流模型燃烧器,以H_(2)、O_(2)和CO_(2)为添加剂对甲烷空气预混火焰(CH4/air)进行调控,探究其对火焰结构、火焰稳定性和排放特性的影响规律。对各个掺混气进行变量控制和工况设计,利用数码相机和OH基平面激光诱导荧光技术测量火焰结构,利用Testo340烟气排放仪测量烟温及污染物CO和NO_(x)排放量。研究结果表明:H_(2)和O_(2)掺混使火焰更加紧凑并增强燃烧强度,而CO_(2)添加对此具有调节作用,它使火焰分布更宽,燃烧强度降低。O_(2)掺混促成富氧燃烧之后,CO和NO_(x)排放量均明显增加,不利于排放特性优化。相比之下,H_(2)掺混在降低CO排放的同时能基本不影响NO_(x)排放水平,同时以CO_(2)替代N_(2)虽然会提高CO排放,但可大幅降低NO_(x)排放。H_(2)和CO_(2)掺混的影响具有较好的互补性,两者结合是实现甲烷稳定低排放燃烧调控的有效方法。Based on a single-head bluff-body and swirl model combustor,the flame structure,flame stability,and emission characteristics of premixed methane flames(CH4/air)were studied,which were regulated by additives of H_(2),O_(2),and CO_(2).Fraction control of the additives was conducted and flame conditions were designed for various premixed mixtures.The flame structure was measured by using the digital camera and the technology of Planar Laser-Induced Fluorescence of OH radical.The flue gas temperature and emissions of pollutants CO and NO_(x) were measured using the Testo340 gas analyzer.The results show that the addition of H_(2) and O_(2) leads to a more compact flame and enhances the combustion intensity,while the addition of CO_(2) is potential to mitigate such effects,causing a more distributed flame shape and a lower combustion intensity.When the oxygen-rich combustion occurs with O_(2) addition,both CO and NO_(x) increase significantly,which is not favorable to reduce the emission.In contrast,the H_(2) addition can reduce the CO emission,while almost not affecting the NO_(x) emission.Simultaneously,although replacing N2 with CO_(2) can increase the CO emission,it significantly reduces the NO_(x).The additives of H_(2) and CO_(2) exhibit complementary regulating effects,and their combination is an effective method to achieve stable and low emission combustion of methane.

关 键 词：燃烧调控 富氢燃烧 富氧燃烧 CO排放 NO_(x)排放 

分 类 号：TK16[动力工程及工程热物理—热能工程]